The only way to change behavior (or improve it, not all behavior can be changed when someone has ADHD), is to determine WHY that behavior is happening, and address the WHY.
There’s a reason he’s being disruptive in class (and he’s likely not even choosing to disrupt). Is he overwhelmed? Is he bored? Is his ADHD untreated? Is there a learning disability making work more difficult? Is the environment too stimulating (sensory issues)? Is he being the class clown to hide the fact that he has a more difficult time with school than his peers? Could he have depression or anxiety? There are so many potential reasons. However, it won’t change until you determine the catalyst of the behavior and work on alleviating that.
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism